lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / shū / yuán / zài / gǔ / dài / guān / zhì / zhōng / de / zuò / yòng

历史课上，老师介绍了枢垣在古代官制中的作用。

In history class, the teacher explained the role of the censorate in the ancient official system.